Investigate the properties and symmetries of quadrilaterals.

Quadrilateral Explorer
Explore the properties of quadrilaterals

Select a type of quadrilateral, and use the buttons below to optionally show the diagonals, and add markings to indicate the important angle, side and diagonal properties. The Fold and Rotate buttons invoke animations to aid investigation of the symmetry of the shape.

The shape can be changed by dragging the blue vertices, and rotated by dragging the green vertex (when present).